buffet: Add a HACKING file

This file should contain recipes for how to make changes to buffet.
It should eventually give pointers for writing in our coding style,
and anything else a developer should know when hacking on buffet.

BUG=None
TEST=None

Change-Id: I0e37864c3bd844c5d5cbd2476ef520c8c685de0e

buffet/HACKING

diff --git a/buffet/HACKING b/buffet/HACKING
new file mode 100644
index 0000000..d657397
--- /dev/null
+++ b/buffet/HACKING
@@ -0,0 +1,16 @@
+Some common workflows for developing with buffet:
+
+# Tell portage that you'd like to make local changes to Buffet:
+cros_workon start --board=${BOARD} platform2
+
+# Edit files in platform2/buffet/
+vim ...
+
+# Compile and install those changes into the chroot:
+USE=buffet emerge-<board> platform2
+
+# Compile and run buffet unittests
+USE=buffet P2_TEST_FILTER="buffet::*" FEATURES=test emerge-<board> platform2
+
+# Deploy the most recently built version of buffet to a DUT:
+cros deploy --board=${BOARD} <remote host> platform2